Ball valve



FIG. 1 is a front perspective view of a ball valve showing my new design;

FIG. 2 is a front elevational view thereof, the rear elevational view being a mirror image of the front elevational view;

FIG. 3 is a right side elevational view thereof, the left side elevational view being a mirror image of the right side elevational view;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a cross-sectional view taken along the line 6—6 in FIG. 4. 

The ornamental design for a ball valve, as shown and described. 